<template>
  <div :class="{'hidden':hidden}" class="pagination-container">
    <el-pagination
      :background="background"
      :current-page.sync="currentPage"
      :page-size.sync="pageSize"
      :layout="layout"
      :page-sizes="pageSizes"
      :total="total"
      v-bind="$attrs"
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"/>
  </div>
</template>

<script>
import { scrollTo } from '@/utils/scrollTo'
import { mapGetters } from 'vuex'
const query = {
  page: 1,
  limit: 0,
  order: '',
  where: []
}
export default {
  name: 'Pagination',
  props: {
    total: {
      required: true,
      type: Number
    },
    page: {
      type: Number,
      default: 1
    },
    limit: {
      type: Number,
      default: 20
    },
    pageSizes: {
      type: Array,
      default() {
        return [5, 8, 10, 20, 30, 50]
      }
    },
    layout: {
      type: String,
      default: 'total, sizes, prev, pager, next, jumper'
    },
    background: {
      type: Boolean,
      default: true
    },
    autoScroll: {
      type: Boolean,
      default: true
    },
    hidden: {
      type: Boolean,
      default: false
    },
    cache: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    ...mapGetters([
      'page_data'
    ]),
    currentPage: {
      get() {
        return this.page
      },
      set(val) {
        this.$emit('update:page', val)
      }
    },
    pageSize: {
      get() {
        return this.limit
      },
      set(val) {
        this.$emit('update:limit', val)
      }
    }
  },
  created() {
    query.limit = this.limit
    query.page = this.page
    const _data = Object.keys(this.page_data)
    if (_data.length !== 0) {
      if (this.page_data.where) {
        query.where = this.page_data.where
      }
      if (this.page_data.order) {
        query.order = this.page_data.order
      }
    }
    if (this.cache) {
      this.$store.commit('PAGE', query)
    } else {
      this.$store.commit('PAGE')
    }
  },
  methods: {
    handleSizeChange(val) {
      if (this.cache) {
        this.page_data.limit = val
        this.$store.commit('PAGE', this.page_data)
      }
      this.$emit('pagination', { page: this.currentPage, limit: val })
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    },
    handleCurrentChange(val) {
      this.$emit('pagination', { page: val, limit: this.pageSize })
      if (this.cache) {
        this.page_data.page = val
        this.$store.commit('PAGE', this.page_data)
      }
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    }
  }
}
</script>

<style scoped>
.pagination-container {
  background: #fff;
  padding: 0 10px;
}
.pagination-container.hidden {
  display: none;
}
</style>
